angell



(No Model.)

4 Sheets-Sheet l.

H. B. ANGELI..

DRBDGBR.

No. 293,932.V

Patented Feb. 1 9, 1884.

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' ANGELL.

"DREDGfBRi No. 293,932. Patented Feb. 19, 1884.

(Nn Model.) 4 Sheets-Sheet 3.

.11. B. ANGBLL.

i DREDGER. 10.293.932. Y vPatented Ieb.- 19, 1884.

4 Sheets-Sheet 4..

(No Model.) Y

H1B. ANGELL,

DRBDGFERl Y ,Patentedebl ,19, 1884.

UNITED STAT-ns PATENT Orricn.

HORACE B. ANGELL, OF SANFRANCISCO, CALIFORNIA.

DREDGER.

SPECIFICATION forming part of Letters Patent No. 293,932, dated February 19, 1884. 4 Application filed November 28, 1883. (No model.)

To @ZZ whom. it may concern:

Beit known that I, Honnon B. ANGELI., of

San Francisco, in the county of San Francisco and State of California, have invented a new and useful Improvement in Dredgers; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention relates to certain improve` ments in apparatus for dredging and excavating, and it consists in novel constructions of the excavating drum and cylinder, in the driving mechanism onthe suction-pipe, the

elevating-ladder and pumping apparatus, and in the various combinations of these several parts, all as fully hereinafter explained and claimed.

In the drawings accompanying this specilication, Figure l is a side elevation of my machine. Fig. 2 is a plan View. Fig. 3 is an enlarged longitudinal section of the excavator and suction-pipe. Fig. 4 is a'transverse seetion of the same. Fig. 5 is a section of the joint of the suction-pipe and ladder-trunnions. Fig. 6 is an epd view of a `iiange of a jointsection. Fig. -7 is an end view of iiange at- R. Fig. 8 is a side view, showing section of boilers and connection with the engine on the ladder. Fig. 9 is a plan view of the joints of the pipe.

In my device I have combined an excavating-drum rotating upon its own axis, with an inclined supporting frame or ladder hinged at its upper end to a dredge-boat, and having a suction-pipe of Xed length supported upon it and leading from the eXcavator to apump and discharge. I am thus enabled to move the excavating-cutter in a vertical are about the trunnions of the ladder, while the side movement is obtained by swinging the dredge-boat about suitable spuds or anc-hors.

A is a dredge-boat, of any suitable construction, carrying boilers and other necessary apparatus, and having the frame or ladder B hinged to oneend, so that the opposite end of the ladder may move in a vertical arc of a circle from the surface of the cut to the lowest point. The suction-pipe C is supported upon this ladder, and its lower end passes through one side of a stationary cast-iron disk, D, which is xed to the bottom or lower end of theladder. A short shaft, E, passes through the center of v this disk and supports ahollow drum or cylinder, F, rof which it serves as the axis. A stuffing-box forms a tight joint where it passes through the disk. This shaft `is provided with thrust-boxes G G, by which it is kept in place as it rotates, and the drum F is keyed to it. This drum is made of boiler -iron, and has holes in its sides and bottom, with flaring scoop-shaped buckets f projecting, so that when the drum is rotated in contact with a deposit of mud or earththey will cut it away and force it into the interior of the drum, where it is stirred or broken up by the teeth or spikes g projecting inward from its sides. The suction-pipe C passes through the lower side of the disk D and extends nearly to the lower head of the drum F, while its side nearest the lower side of the drum is made open, as at c. I prefer to make this opening fiaring, as at Fig. 4, so that the Vmud which is excavated by the scoops and brought into the cylinder will be drawn into the pipe freely by the action of the pump.

In order to drive the cylinder F, which may be six or more feet in diameter and length, a strong gearing, H, is xed to its upper rim, and a pinion, I, driven by the shaft J, meshes with it, so that while supported and rotating upon the central shaft, E, it is driven from the exterior of its rim, and thus has the power applied tothe greatest advantage and with the least danger of breakage. The shaft J extends upward along the ladder B, and is connected with the engine K, by which it is driven. These engines are vmounted upon the upper end of the ladder, so as to partake of its motion as it is moved up and down, and the relative posi@ tion of the engine and driving-shaft J is thus always maintained the same.

In order to connect `the engines upon the ladder with the stationary boilers upon the boat, I employ the movable jointed pipes L, having the steam-tight rotating j oints M, which allow the pipes to extend or shorten with the movements of the ladder and the engines upon it.

The suction-pipe C has a horizontal joint at N, and two elbows, O O, connecting with that part upon the boat, and through this with the pump P, which is driven by power derived from the engines T. The horizontal joint of the pipe has its axis in an exact line with the shafts or trunnions Q ofthe ladder, and these IOO , enter sockets It, formed on the elbows O, so

that the shafts and pipe-joint have the same axis, about which the ladder is turned as it is raised or lowered, and whatever may be the movement of the ladder, the pipe is always kept tight while accommodating itself to the movement, and the rotary joints are easily kept in order. It will be seen that the ladder is thus hinged and the pipe jointed, so that they may swing in a vertical plane to any angle from a horizontal position to a vertical; but the length of the ladder is such that in practice it will rarely be necessary to drop its lower end to more than forty-five or fifty degrees to make a cut'as deep as desired. That portion of the pipe C which is upon the boat has a joint and stuffing-box at N, so the con-- nection isv readily made with the pump, and any settling of the ladder out of line is compensated by slight motion or turning of the joint, so that the pipe will not be strained. The weight ofthe ladder and its appurtenances is so great that it is desirable to give it some buoyancy; and I therefore attach an air-tight hollow iioat, S, of any suitable dimensions, near the lower end of thc ladder, so that its buoyancy may assist in raising it, when desired, or prevent too great weight upon the excavator or the suspending-chains. The ladder is raised or lowered by machinery upon the deck of the boat, having chains aleading over pulleys V, and connecting with bails XV upon the ladder.

The suction-pipe C is secured to the ladder or frame, so as to pass through the disk D and into the drum F close to the side whichislowest, so 'that the buckets or scoops f, which will do the most of the excavating upon that side, will deliver the material into the drum close to the pipe, and its Haring mouth or opening allows the suction of the pump to draw it in with sufficient water to maintain the proper consistency without any vother special construction. The spikes g will stir the mass and break up any hard lumps, so that it may be drawn into the suction-pipe.

rIhe driving-shaft .I and pinion I are at the opposite or upper side of the drum F, and as the engines K are mounted upon the upper end of the ladder, it will be seen that the shaft J is driven by the direct action ofthe engineshaft pinion X upon the gear-wheel V, which is secured to the upper end of the shaft J. I thus obtain the simplest and most direct mechanism for the purpose. The speed of the pump and that of the excavator may be varied and regulated independently .of each other to suit the relative work to be done, because oi' the independent engines upon the boat and ladder.

I am aware that it has been proposed to exeavate dredged material by means of an excavator composed of two concentric drums tting closely together, and having peripheral openings adapted to register. at certain intervals in connection with a suction-pipe, which enters a short distance into the inner drum,

and is connected with the pump on the scow, and I desire to disclaim this combination of devices.

Imake no claim, broadly, in this application to the excavator above described, as a claim to that feature is embodied in an application, No. 85,800, for a patent made by me February 21, 1883, and now pending in the Fatent Office.

Having thus described my invention, I claiml. In a dredging-machine, the hinged ladder swinging in a vertical arc, and having the rotary excavating-cylinder F at its lower end, and the suction-pipe G, extending from said excavator along the ladder and to a suctionpump, I?, in combination with the drivinggear II, pinion I. shaft J, and the engine K, supported upon the upper end of the ladder, substantially as herein described.

2. In a dredging-machine, the ladder or frame B, hinged to the boat A, so as to have a movement in a vertical arc, in combination with the rotary excavator F, mounted at its lower end, and the engines K upon its upper end, with the connecting-shaft J and gearing, so that the whole moves together, and their relative positions remain unchanged, .as herein described.

3. In a dredging-machine, the ladder B, hinged to the boat A, and having the rotary excavator F at its lower end, the suction-pipe C, leading to the pump I) upon theboat, and the engine K, `mounted upon and moving with the ladder, in combination with the elbows O O, rotary joint N, and shafts Q, substantially as herein described.

4. In a dredging-machine, the boat A, with the stationary boilers, in combination with IOO the hinged ladder or frame B, supporting the rotary excavator F and driving-engine K, and the pipes L, with the extension-joints M, substantially as herein described.

5. In a dredging-machine, the ladder or frame B, hinged to the boat A, and having the excavator F and driving-engine K mounted upon. it, in combination with the float S, substantially as herein described.

6. rlhe rotary drum F, having the exterior excavating-openings f, by which material is carried into the drum, in combination with the inwardly-projecting spikes, stirrers, or cutters g and a stationary suction and discharge pipe, C, substantially as herein described.

7. Ina dredging-machine, the ladder B, hinged to the boat A, and having the rotary excavator F at its lower end, the suction-pipe C, leading to the pump I) upon the boat, in combination with the elbows O O, rotary joint N and shafts Q, and the supplementaljoint N', whereby the pipe may be adjusted, substantially as herein described.`

8. In a dredging-machine, a ladder hinged to a boat so as to swing in a vertical arc, a rotary excavator supported at its lower end, a suction and conveying pipe extending from IIO the excavator to a pump upon the boat, With Suitable connecting-joints, -in combination with an engine upon the boat and a supplemental engine upon the ladder, whereby the 5 pump and excavator may be driven independently and at different rates of speed, substantially as herein described.

9. A dredging device consisting of a xed disk, D, a driven supporting-shaft, E, pass- 10 ing through such disk, a single hollow exeavating-drum mounted upon said shaft, and having excavating openings or buckets, and a suction-pipe passing through the disk.

In testimony whereof I have signed my name to this specification in the presence of two I 5 subscribing Witnesses. H. B. ANGELL.

` Vitnesses:

J. B. THOMPSON, F. L. MIDDLETON. 

